Spectrally accelerated edge and scrape-off layer gyrokinetic turbulence simulations

IF 3.4 2区物理与天体物理 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computer Physics Communications Pub Date : 2025-08-21 DOI:10.1016/j.cpc.2025.109817

B.J. Frei , P. Ulbl , J. Trilaksono , F. Jenko

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引用次数: 0

Abstract

This paper presents the first gyrokinetic (GK) simulations of edge and scrape-off layer (SOL) turbulence accelerated by a velocity-space spectral approach in the full-f GK code GENE-X. Building upon the original grid velocity-space discretization, we derive and implement a new spectral formulation and verify the numerical implementation using the method of manufactured solution. We conduct a series of spectral turbulence simulations focusing on the TCV-X21 reference case (Oliveira et al., 2022 [26]) and compare these results with previously validated grid simulations (Ulbl et al., 2023 [25]). The spectral approach reproduces the outboard midplane (OMP) profiles (density, temperature, and radial electric field), dominated by trapped electron mode (TEM) turbulence, with excellent agreement and significantly lower velocity-space resolution. As a consequence, the spectral approach reduces the computational cost (CPUh) by at least an order of magnitude, of approximately 50 for the TCV-X21 case. This enables high-fidelity GK simulations to be performed within a few days on modern CPU-based supercomputers for medium-sized devices and establishes GENE-X as a powerful tool for studying edge and SOL turbulence, moving towards reactor-relevant devices like ITER.

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光谱加速边缘和刮擦层回旋动力学湍流模拟

本文首次在全GK代码GENE-X中用速度-空间谱方法模拟了边缘和刮擦层湍流。在原有网格速度空间离散化的基础上，推导并实现了一种新的谱公式，并用制造解的方法验证了数值实现。我们以TCV-X21为参考案例（Oliveira等人，2022年）进行了一系列光谱湍流模拟，并将这些结果与之前验证的网格模拟（Ulbl等人，2023年）进行了比较。光谱方法再现了由捕获电子模式（TEM）湍流主导的外机身（OMP）剖面（密度、温度和径向电场），具有极好的一致性和明显较低的速度空间分辨率。因此，频谱方法将计算成本（CPUh）降低了至少一个数量级，对于TCV-X21而言，降低了约50个数量级。这使得高保真GK模拟可以在几天内在中型设备的现代基于cpu的超级计算机上进行，并使GENE-X成为研究边缘和SOL湍流的强大工具，朝着ITER等反应堆相关设备的方向发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computer Physics Communications 物理-计算机：跨学科应用

CiteScore

12.10

自引率

3.20%

发文量

287

审稿时长

5.3 months

期刊介绍： The focus of CPC is on contemporary computational methods and techniques and their implementation, the effectiveness of which will normally be evidenced by the author(s) within the context of a substantive problem in physics. Within this setting CPC publishes two types of paper. Computer Programs in Physics (CPiP) These papers describe significant computer programs to be archived in the CPC Program Library which is held in the Mendeley Data repository. The submitted software must be covered by an approved open source licence. Papers and associated computer programs that address a problem of contemporary interest in physics that cannot be solved by current software are particularly encouraged. Computational Physics Papers (CP) These are research papers in, but are not limited to, the following themes across computational physics and related disciplines. mathematical and numerical methods and algorithms; computational models including those associated with the design, control and analysis of experiments; and algebraic computation. Each will normally include software implementation and performance details. The software implementation should, ideally, be available via GitHub, Zenodo or an institutional repository.In addition, research papers on the impact of advanced computer architecture and special purpose computers on computing in the physical sciences and software topics related to, and of importance in, the physical sciences may be considered.